WIMP Dark Matter and Baryogenesis

TL;DR

This paper proposes a model linking dark matter relic density to baryon asymmetry, predicting dark matter mass and offering testable signals at LHC and in direct detection experiments.

Contribution

It introduces a baryon(lepton) number conserving model where dark matter asymmetry is tied to baryon asymmetry, making dark matter mass predictive.

Findings

Dark matter mass predicted between a few GeV and TeV.

Model links dark matter relic density to baryon asymmetry.

Testable predictions for LHC and direct detection experiments.

Abstract

In the present universe visible and dark matter contribute comparable energy density although they have different properties. This coincidence can be elegantly explained if the dark matter relic density, originating from a dark matter asymmetry, is fully determined by the baryon asymmetry. Thus the dark matter mass is not arbitrary, rather becomes predictive. We realize this scenario in baryon(lepton) number conserving models where two or more neutral singlet scalars decay into two or three baryonic(leptonic) dark matter scalars, and also decay into quarks(leptons) through other on-shell and/or off-shell exotic scalar bilinears. The produced baryon(lepton) asymmetries in the dark matter scalar and in the standard model quarks(leptons) are thus equal and opposite. The dark matter mass can be predicted in a range from a few GeV to a few TeV depending on the baryon(lepton) numbers of the decaying scalars and the dark matter scalar. The dark matter scalar can interact with the visible matter through the exchange of the standard model Higgs boson, opening a window for the dark matter direct detection experiments. These models also provide testable predictions in the searches for the exotic scalar bilinears at LHC.